Will parsers break if we start logging the GC cause as part of the PrintGC logging?

[Vitaly Davidovich]

Hi Bengt,

Another option would be to enable the extra logging/new format via a VM
argument? I know there are already tons of them so this is probably
undesirable, but may provide at least a transition period for customers to
upgrade their parsers.

Sent from my phone
On May 7, 2012 5:19 PM, "Bengt Rutisson" <bengt.rutisson at oracle.com> wrote:

>
> Hi all,
>
> I have a webrev out for a change that will add the GC cause to all "Full
> GC logging". See:
>
> http://permalink.gmane.org/gmane.comp.java.openjdk.hotspot.gc.devel/4527
>
> The extra information was intentionally just added to full GCs since
> this logging already had information for System.gc() calls so we figured
> that any parsers out there would have to handle this information anyway.
>
> It was requested to add the information about the GC cause also to CMS
> collections. If I start down that path I think I could just as well add
> the GC cause to all GC logging. If we break any parsers we will probably
> break them already when we add the cause to CMS GCs.
>
> Not sure what the best way to handle this is. Some suggestions:
>
> (1) Only add cause to Full GCs (as in my change now)
> (2) Only add cause to Full GCs and CMS GCs (as I think is what was
> suggested)
> (3) Add cause to all GCs (probably the proper but kind of risky way)
> (4) Only do (1) but file CRs for (2) and (3)
>
> Any thoughts? It is really a choice between getting interesting
> information and risking breaking existing GC log parsers.
>
> Here is the latest webrev:
> http://cr.openjdk.java.net/~brutisso/7166894/webrev.01/
>
> Thanks,
> Bengt
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